This image shows the welcome page for the query servlet example. It says the following:
The query is
SELECT ename, empno FROM emp WHERE ename LIKE xxx
Specify the WHERE clause xxx parameter.
Enclose entry in single-quotes; use % for wildcard. Search is case-sensitive.
Example: 'S%' (for all names starting with 'S').
This text is followed by a field to enter the xxx parameter, then a Submit Query button you click to submit the query.
(End of description.)